iOS: Twist is a clever app that tracks your current location, as well as where you're headed, and keeps your friends informed of your progress so they'll know exactly when you're going to arrive. Of course, it works the other way around, too—if you want to track your friends and they're using Twist, you can find out when they're going to arrive as well.

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One particularly nice thing about Twist is that other people don't have to have it to be notified. Twist can send text messages to specified recipient as you're driving along, and it'll alert them if your ETA changes (for better or for worse). If they do have the app, they can register their phone so alerts will come as push notifications instead of text messages. You can also save favorite locations to easily create new alerts (which the app calls twists), or pull locations from events you already have in your calendar. It's a really cool app for keeping people up to date on your whereabouts distraction-free.